Undefined property when accessing model class

[eluser]gor1lla[/eluser]
[quote author="pbarney" date="1282486121"]You're leaving out some code that might be important to diagnose the problem.

The error says there's a problem on line 16, but there are only 14 lines that you show us.

Please post the actual file.[/quote]

i delete some of the code that was commented.

i have attached the file and now the error is on line 13
when i am trying to access the $this->category_model->get(1);